Walter s



(No Model.)

W. PIERCE. UALGINING APPARATUfi.

No. 505,956. Patented 0013.3,1893.

' UNITED. STATES PATENT QFFIQE.

WALTER srmncn, OF NEW YORK, N. Y.

CALCINING APPARATUS.

.QPECIFICATION forming part of Letters Patent No. 505,956, dated October 3, 1893.

Application filed October 31, 1891. Serial No. 410,482. (No model.)

To all whom it may concern:

Be it known that I, WALTER S. PIERCE, a citizen of the United States, residing at New York city, in the county and State of New York, have invented a certain new and useful Improvement in Oalcining Apparatus, of which the followingis a specification.

The object of my invention is an apparatus which will effect a uniform and equable drymg of any finely divided material, such as phosphates of alumina and iron.

In carrying out my invention I provide a revoluble cylinder into which the material to be calcined is introduced; the inner surface of this cylinder I provide with a series of blades running longitudinally of the cylinder, each blade being inclined from the feed end of the cylinder toward the discharge end, and said blades occupying only aportion of the inner circumference of the cylinder. I also arrange in the cylinder a series of longitudinal ribs, each separated from the other by some considerable space, a sufficient number of the ribs being employed to extend from near one end of the inclined blades around the cylinder. The purpose of the inclined blades is to both feed and tumble the material undergoing treatment. They,in conjunction with the longitudinal ribs, elfect an additional tumbling whereby'it is insured that the material undergoing treatment will be thoroughly and equally subjected to the calcining action. Any suitable method of heating may be used, as may any suitable devices for rotating the cylinder and feeding and discharging the material undergoing treatment, my improvement relating especially to the cylinder.

In the accompanying drawings illustrating a form of apparatus embodying my invention, Figure 1 is a side elevation, partly in section, of said apparatus; and Fig. 2 is a cross-sectional elevation taken on the plane of the broken line a:-zv of Fig. 1.

A represents a furnace provided with the usual accessories of grate, ash pan, flue, doors, &'c.

B is a shaft or axle carried in suitable bearings 0 supported from the masonry work of the furnace, said axle being driven by suitable gearing B bolted to the driving power.

D is the calcining cylinder carried by the axle B, upon which it is supported by the spiders E. This cylinderis provided at its feed end with an internal flange F projecting inward at right-angles to the axle, the purpose of which is to prevent the material which is fed into the cylinder from the hopper G from falling out. A loiigitudinal series of blades H are fastened to the inner side of the cylinder. Each of said blades is somewhat scoop-shaped in form as shown in Fig. 2 and is inclined from the feed toward the exit end of the cylinder, the last blade H of the series extending somewhat beyond the cylinder end, as shown in Fig. 1, so as to insure a proper discharge of the material. a single series of these blades, though a greater number may be employed Without departing from my invention. For a cylinder thirty inches in diameter and twenty feet in length I prefer to employ a single row of blades H as shown, each blade being about two feet long and five inches deep with an in clination toward the axis of the cylinder of about forty-five degrees, each blade in the series being separated from its neighbor by about one foot.

In addition to the blades H I provide in the cylinder a series of longitudinal ribs I, as best shown in Fig. 2, the depth of these ribs I for a cylinder of the dimensions given above being about one and a half inches. These ribs may be arranged at uniform distances apart and any desired number may be employed.

In operation the material to be treated is fed into the cylinder to a depth somewhat less than the depth of the blades H, and upon the rotation of the cylinder these blades, by

reason of their inclination,feed the material forward, efiecting, in combination with the ribs I, a thorough tumbling of the material and a regular movement thereof through the cylinder,thereby insuring auniform and rapid calcining.

I claim A cylinder for a calciner revolublysup- I have shown but ported and provided on its inner periphery of inclined blades to near the other end, subwith a longitudinal series of blades oconpystantially as set forth, IO ing only a portion of theinner circumference This specification signed and witnessed this of the cylinder, each blade of the series be- 28th day of October, 1891.

5 ing inclined with relation to the axis of the WALTER S. PIERCE.

cylinder, and a series of longitudinal ribs ex- Witnesses: tending around the inner circumference of D. H. DRISCOLL,

the cylinder from near one end of the series J. A. YOUNG. 

